eth/downloader: circumvent download race between crosscheck and hashes
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@ -284,12 +284,14 @@ func (d *Downloader) fetchHashes(p *peer, h common.Hash) error {
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}
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if !done {
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// Try and fetch a random block to verify the hash batch
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cross := inserts[rand.Intn(len(inserts))]
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glog.V(logger.Detail).Infof("Cross checking (%s) with %x", active.id, cross)
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d.checks[cross] = time.Now().Add(blockTTL)
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active.getBlocks([]common.Hash{cross})
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// Skip the last hash as the cross check races with the next hash fetch
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if len(inserts) > 1 {
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cross := inserts[rand.Intn(len(inserts)-1)]
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glog.V(logger.Detail).Infof("Cross checking (%s) with %x", active.id, cross)
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d.checks[cross] = time.Now().Add(blockTTL)
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active.getBlocks([]common.Hash{cross})
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}
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// Also fetch a fresh
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active.getHashes(head)
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continue
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